NZS 3101 Punching Shear

Based on NZS 3101:2006 Clauses 7.10 and 11.5. Calculate punching shear capacity for slab-column connections.

Materials & Slab

Concrete strength f'c (MPa)

Slab thickness h (mm)

Effective cover c (mm)

Effective depth d (mm)

Column

Column dimension c1 (mm)

Column dimension c2 (mm)

Applied shear V (kN)

Moment transfer factor γ

Results

Punching shear capacity

Perimeter bo-

Critical section Ao-

vc (MPa)-

Vc capacity (kN)-

Applied v (MPa)-

Utilisation-

Enter values and compute

Formulas (Clause 11.5)

v_c = min(0.17(1+2/βc)√f'c, 0.34√f'c)
βc = longer/shorter column side
bo = 4(c1 + d) for interior column
Vc = vc · bo · d

Notes

Assumes interior column (critical section at d/2).
For edge/corner columns, adjust bo per Clause 11.5.
Results are for quick checks; verify with full design.